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A new apparatns Ibr density nleasuremcnts of Iluids in the entire range 11o111 gas to liquid densities is presented. The instrunlent is a single-sinker buoyancy densitometer designed in a completely new way. Tile buoyancy Ibrce exerted by the sample fluid on an immersed sinker (buoy) is transferred by a new type of magnetic suspension coupling In an analytical balance. In order In reduce drastically the linearity error of the Icommercial) balance, a special basic load compensation is applied which also avoids any buoyancy effect of the laboratory air on tile balance. The new single-sinker densitometer covers a density range Irom I0 In 21100 kg. m ~ at temperatures from 233 to 523 K and pressures tip to 30 MPa. A special compact version of such a single-sinker densitometer can even be used at temperatures from 8{1 to 523 K at pressures up to 100 MPa. Test measurements on densities of carbon dioxide at 233. 36(I, and 523 K at pressures up to 30 MPa show that the estimated total uncertainty of _+().02'% to +0.()3". in density is clearly met.KEY WORDS: density: high pressure: high temperature: magnetic suspension balance; single-sinker densitometer.

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